What are the production factors that affect the quality of silicone tubes? Let me introduce you to the following.
1. viscosity. Scientific and technical terminology: liquid, proposed liquid, or proposed solid material flow resistance volume characteristics, that is, by external forces and flow, intermolecular The internal friction or resistance to flow presented. Usually, viscosity is directly proportional to hardness.
2. hardness. The ability of a material to locally resist hard objects pressed into its surface is called hardness. Silicone rubber has a Shore hardness range of 10 to 80, which gives the designer full freedom to choose the desired hardness, to optimize the hardness of the rubber. Specific functions can be achieved. Various intermediate hardness values can be achieved by blending polymer substrates, fillers, and additives in different proportions. The time and temperature of heat curing can likewise change the hardness without destroying other physical characteristics.
3, tensile strength. Tensile strength refers to the force required to cause a rubber material sample to tear on each unit of the range. The tensile strength of thermosulfurized solid silicone rubber ranges from 4.0-12.5MPa. Fluorosilicone rubbers have a tensile strength range of 8.7-12.1 MPa. The tensile strength range of liquid silicone rubber is between 3.6-11.0MPa.
4. tear strength. The resistance to the force applied to a sample with an incision that impedes the expansion of the incision or score. Hot vulcanized solid silicone rubber will not tear, even when subjected to extremely high torsional stresses after cutting. Tear strengths of thermosulfide solid silicone rubbers range from 9-55 kN/m. Fluorosilicone rubbers have a tear strength range of 17.5-46.4 kN/m. Liquid silicone rubber tear strength range between 11.5-52 kN/m.
5, elongation. Usually refers to the “ultimate rupture elongation” or when the sample fractures relative to the original length of the percentage of growth. Thermosulfur solid silicone rubber elongation of the general range between 90 to 1120%. Fluorosilicone rubbers have a typical elongation range of 159 to 699%. Liquid silicone rubbers typically have elongation ranging from 220 to 900 percent. Different processing methods and choices of hardeners can greatly vary elongation. The elongation and temperature of silicone rubber have a great relationship.
6, operation time. Operating time from the moment the colloid joined the vulcanizing agent began to calculate. The operating time and the latter vulcanization time is not exactly the boundaries, the colloid from the moment the vulcanizing agent has been added! The operation time is 30 minutes without affecting the quality of the finished product. Therefore, the more time is saved during the operation of the product, the more favorable the finished product.
7, vulcanization time. Some places will say that the curing time. That is after such a long time silicone vulcanization reaction is over. The basic end of this is to say that the product has been available, but there is a small part of the curing reaction has not ended. So the use of silicone rubber products, such as silicone molds is usually put into use again for some time.
Comprehensive news about silicone and casting
Link to this article：What are the production factors that affect the quality of silicone tubes?
Reprint Statement: If there are no special instructions, all articles on this site are original. Please indicate the source for reprinting.：Silicone And Casting，Thanks！^^